The northbound side of the Lake Pontchartrain Causeway has reopened after a 21-foot fiberglass boat hit the bridge Friday morning, authorities said. An unidentified woman in the boat was injured in the accident, according to Jefferson Parish and bridge authorities.

She was taken to a local hospital, according to Col. John Fortunato, spokesman for the Jefferson Parish Sheriff's Office.

The northbound span was closed for about 30 minutes so emergency responders could lift some of the boaters out of the lake and onto the bridge, Causeway General Manager Carlton Dufrechou said. The bridge was not damaged, he said.

The boat, carrying five people, was traveling west at about 10 a.m. and crossed beneath the northbound span about a mile from the south shore, Dufrechou said. As it traveled beneath the southbound span, the boat hit a piling and two people were tossed out of the vessel, he said.

The boat's operator lost steering control, Fortunato said.

One of those thrown into the lake was wearing a life jacket, Dufrechou said. The other person had no life jacket but was thrown a flotation device by a Causeway worker, he said.

The extent of the woman's injuries was not available.

A crew in a workboat doing work beneath the Causeway responded to the scene. The workboat towed the damaged vessel to the Bonnabel boat launch in Metairie, Dufrechou said.

The Coast Guard and state Department of Wildlife and Fisheries are investigating the accident, he said.

The boat was significantly damaged, authorities said.

"The bridge looks fine," Dufrechou said. "We are nevertheless, in an abundance of caution, dispatching one of our engineers to look at the pilings."

The accident is being investigated by the Louisiana Department of Wildlife and Fisheries.